Method and apparatus for channel prediction in wireless networks
First Claim
1. A communication system, comprising:
- a mobile unit operative to transmit periodic channel condition indicator signals, each indicator signal including information relating to a signal to noise ratio being experienced by the mobile unit; and
a base station operative to transmit data to the mobile unit, the base station being operative to receive the indicator signals from the mobile unit and generate a channel condition prediction reflecting a channel condition expected to be experienced by the mobile unit, the channel condition prediction being based on a balanced estimate using the most recent channel condition indicator value and a mean of past channel condition indicator values.
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Abstract
Techniques and systems for channel prediction in wireless networks. A base station receives a succession of channel indicators from each of a plurality of mobile units, each channel indicator being received from each mobile unit once per timeslot. A channel predictor uses the channel indicators to generate a channel condition prediction for each mobile unit, the channel condition prediction being based on a balanced estimate using the most recent channel condition indicator and the mean of the succession of channel indicators. A weight is computed based on a gradient of the succession channel indicator values and used to assign relative emphasis to the most recent channel condition indicator and the mean channel condition indicator in order to give greater emphasis to the most recent indicator during slowly changing conditions and greater emphasis to the mean indicator during rapidly changing conditions.
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Citations
15 Claims
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1. A communication system, comprising:
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a mobile unit operative to transmit periodic channel condition indicator signals, each indicator signal including information relating to a signal to noise ratio being experienced by the mobile unit; and
a base station operative to transmit data to the mobile unit, the base station being operative to receive the indicator signals from the mobile unit and generate a channel condition prediction reflecting a channel condition expected to be experienced by the mobile unit, the channel condition prediction being based on a balanced estimate using the most recent channel condition indicator value and a mean of past channel condition indicator values. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A base station for communicating with a plurality of mobile units, comprising:
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an air interface for receiving transmissions from the mobile unit, periodic ones of the transmissions including a channel condition indicator providing information relating to a signal to noise ratio being experienced by the mobile unit; and
a predictor for receiving channel condition indicator values and generating future channel condition predictions reflecting a future channel condition expected to be experienced by each mobile unit, each of the future channel condition predictions being based on a balanced estimate using the most recent channel condition indicator value for the mobile unit and a mean of past channel condition indicator values for the mobile unit.
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8. A predictor for generating a channel condition prediction for each of a plurality of mobile units, comprising:
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a data interface module for retrieving channel condition indicators, each channel condition indicator reflecting past channel conditions experienced by one of the plurality of mobile units; and
a computation module for computing a mean channel condition indicator value for each mobile unit, based on a mean of channel condition indicators associated with the mobile unit and for generating a channel condition prediction based on a balanced estimate using the most recent channel condition indicator value and a mean of past channel condition indicator values. - View Dependent Claims (9, 10)
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11. A method of channel condition prediction, comprising the steps of:
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receiving and storing a succession of channel condition indicators from each of a plurality of mobile units, each channel condition indicator received from a mobile unit reflecting a channel condition reflected by the mobile unit; and
generating a channel condition prediction for a time of interest for each mobile unit, each channel condition prediction reflecting a balanced estimate using the most recent channel condition indicator value and a mean of past channel condition indicator values. - View Dependent Claims (12, 13, 14, 15)
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Specification